Fuel oil pump



Feb. 4, 1958" v. A. BRUNSON 2,821,934

FUEL on. PUMP Filed May 28, 1954 2 Sheets-Sheet 1 I \6 m u n F6 IngenforMMVM \HY H ABrumson Feb. 4, 1958 v. A. BRUNSO'N' 2,821,934

FUEL OILfUMP.

Filed May 28, 1954 2 Sheets-Sheet 2 Lgj llggulABrumson United StatesPatent FUEL OIL PUMP Virgil A. Bronson, Grand Rapids, Mich., asslgnor toBlackmer Pump Company, Grand Rapids, Mrch., a corporation of MichiganApplication May 28, 1954, Serial No. 433,043

1 Claim. (Cl. 103-221) This invention relates to fuel oil pumps and itsobject is to provide means in such pumps for the flow of 011 through thepump in reverse to the pumping direction of the flow.

The invention is particularly applicable to portable pumps used in thefield to supply tractors, etc. In such use, the pump is usually used topump fuel oil from a barrel which may be located on the ground or in atruck which transports it from place to place.

When the barrel is on the ground and the fuel tank is higher than thepump, after the fuel tank has been completely filled it is desirable todrain the fuel in the pump hose back into the barrel before removing thehose from the fuel tank to avoid spilling the contents of the hose uponthe ground.

When the fuel barrel is on a truck and is higher than the fuel tank ofthe tractor, it is desirable to cause the fuel to flow by gravity or asiphoning action to avoid the labor of operating the pump and thisinvention provides means for the free flow of the fuel through the pumpfor this purpose.

The invention is frequently used with a pump operated by a hand leverwhich has means for being locked in a certain position and the inventionprovides means for moving the lever to the locking position after thefuel tank has been filled without pumping excess fuel through the hose.

The invention is not limited to the aforedescribed uses nor to pumps forfuel oil but may be used on pumps for any free flowing liquid and forvarious purposes.

The invention provides various features of construction and arrangementhereafter more fully described, reference being had to the accompanyingdrawings in which:

Fig. 1 is a vertical elevation of a pump embodying the invention withparts in section,

Fig. 2 is a fragmentary vertical section of the same with parts moved toa different position,

Fig. 3 is a fragmentary transverse vertical section on the line 33 ofFig. 1,

Fig. 4 is a fragmentary sectional plan on the line 4-4 of Fig. 1,

Fig. 5 is an elevation, partly in section similar to Fig. 1 but showinga modified structure,

Fig. 6 is a fragmentary detail of the retaining spring of Fig. 3,

Fig. 7 is a fragmentary section of the by pass valve of Fig. 5, and

Fig. 8 shows the pump mounted in a fuel barrel.

Like numerals refer to like parts in all of the figures.

The pump has a main body 1 in which is a cylinder 2. A piston 3 isprovided to reciprocate in the cylinder 2 and has a piston rod 4extending outside the cylinder and is connected at 5 to an operatinglever 6 which has a con ventional handle 7.

The pump has a lower inlet chamber 8 to which is connected the inletpipe 9 which is inserted into a fuel barrel 10, and an upper outletchamber 11, connected to an 2 outlet pipe 12 to which is connected aflexible fuel hose 13.

The inner end of the cylinder 2 is in full communication with theinterior of the body 1 which is separated from the chambers 8 and 11 byhorizontal partitions 14 and 15 through which are the valve passages 16and 17. Inlet and outlet valves 18 and 19 respectively operate to openor close the passages 16 and 17, each openingin the direction of flow offuel through the pump and closing to prevent reverse flow.

In normal operation reciprocation of the piston 3 draws fuel oil intothe pump body 1 through the inlet valve 19 and forces it out through theoutlet valve 18 from where it passes through the pipe 12 and hose 13 tothe desired receptacle. The operating lever 6 has pivotal connection atits lower end with the pump body 1 by a link 20 and above its connection5 with the piston rod 4 it has an eye 21 which registers with acorresponding eye 22 on the pump body. A padlock hasp may be passedthrough the two eyes to prevent unauthorized operation of the pump Inthe style of pump shown in Figs. 1-4, a push rod 25 is located in thepump body 1 at the end of the cylinder 2 and is guided for verticalmovement in the bases 26. A spring 27 normally thrusts the push roddownward. The upper end of the push rod is located below the outletvalve 18 and the lower end of the push rod is hook shaped to catch underthe edge of the inlet valve 19.

A hand lever 28 located on the outside of the body 1 is mounted on ashaft 29 which passes into the interior of the body where it is providedwith a radially projecting pin 30. One end of the pin 30 lies in a Ubend 31 in the push rod and its other end engages a detent spring 32having a pump therein.

In its normal lower position, where it is thrust by the spring 27 asshown in Fig. 1, the push rod 25 does not engage either of the valves 18or 19 and permits them to open and close in the normal operation of thepump. But when the push rod is raised as in Fig. 2 by operation of thehand lever 28, the valves 18 and 19 are both raised to open position andheld there by action of the detent spring 32.

When both valves are thus held open, the pump will not function and anyliquid in the outlet pipe 12 or hose 13 above the pump will flow backthrough the pump to the barrel 10. Also when the valves 18 and 19 areboth open the outlet of the hose is below the level of liquid in thebarrel 10, a siphoning action occurs causing liquid to flow by gravitythrough the pump without operating the piston 3.

In the modified form of Fig. 5 the push rod 25 is not used but theliquid can be by-passed around the cylinder 2 and valves 18 and 19through a passage 35 which is normally closed by a cock 36. In thisform, when the cock 36 is open, operation of the piston 3 is inefiectiveand reverse flow of the fluid through the pump is accomplishedsubstantially the same as though the valves 18 and 19 were held open andthe siphoning action also occurs because the passage 35 permits a freeflow from the inlet chamber 8 to the outlet chamber 11.

The invention is defined in the appended claims which are to beconsidered comprehensive of all forms coming within their scope.

I claim:

A pump comprising a body in which are a cylinder and a piston, an inletpassage opening to the bottom of said body, and an outlet passageopening to the top of said body both communicating with said cylinder,an inlet and an outlet valve in each of said passages, said pistonnormally acting to pump liquid through said valves from s 2 -.4 saidinletpassage through'said outlet passage, and a single 793,577 Frank QJune 27, 1905 manua'Hy-operated-means' acting to-open bothsaid valves,$30556- Nelson "Sept."4;1906 to permit a gravity reversofiow of liquidthrough said 877,661 Patterson Jan. 28, 1908 pump,vy,hen said piston isat l est, said inlet and o\ 1 t1et 895,666 Nelson Aug. 11, 1908 passages'andsaid cylinder"being-aligned' and gggerfilly 5 978,852 CunninghamDec. 20, 1910 pa 'allel with said by pass passage, so jchat said grayity 1,482,376 Anderson Feb. 5, 1924 flow"will-drain-said cylinder ;and--pas s2 1ge s. 1,723,493 Schotthoeier,, Aug. 6, 1929 gkefierepcesCited in the filo-of. ,th is patent :UNITED' STATESJ PATENTS 10 143,724.Sidney Oct. 14, 1873

